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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d95ea990bb911706cc13eedef4443bb28c2c7f5ed3808d359b764c63c0a5b6' 
  AND token = 'oLyNrSqbbJkrMI1GiFwoy73OZ2FAD1KEaydHXL6y3SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}